llvm dev - Jan 2011 - [LLVMdev] Build problems and workarounds with CMake and XCode

Hello everyone,

I finally gave up on trying to build under Eclipse on my Mac because I had a 
non-functioning installation on there that kept intercepting the command line 
entries on the path.  Uninstalling the old MacPorts install of LLVM 2.6 helped 
but not completely.

I tried making a separate build of LLVM SVN in XCode using build files created 
with CMake.  Surprisingly, it worked better than Eclipse!  The Build_All target 
completed its build.  The install target was another story though.  First of 
all, the commands to install with the terminal command-line needed to be 
prefaced with sudo to work.  Secondly, those commands, when executed from XCode,
have no open console to prompt for a password.

My workaround for that was to write a small utility in Qt to prompt for a 
password and return it in stdout.  I then set the path of that utility to the 
SUDO_ASKPASS environment variable so I could set the scripts to run sudo -A 
command instead of sudo command.  This unearthed a second problem.  In my debug 
build, the script looked in the release directory for LLVMSupport.a and failed 
as a result of it.

At this point I'm building a release build so I can install the debug build.
 If Óscar or somebody more familiar than I at CMake would look into the issue of
the release install in the debug build, I'd appreciate it.  Secondly, if
anyone
would be interested in my password prompter software, I'd be interested in 
releasing it as open-source.

Thanks for your time and efforts,

--Samuel Crow

Samuel Crow <samuraileumas at yahoo.com> writes:

[snip]
> I tried making a separate build of LLVM SVN in XCode using build files
created
> with CMake.  Surprisingly, it worked better than Eclipse!  The Build_All
target
> completed its build.  The install target was another story though.  First
of
> all, the commands to install with the terminal command-line needed to be 
> prefaced with sudo to work.
Have you permissions for those directories?
>  Secondly, those commands, when executed from XCode, 
> have no open console to prompt for a password.
That lies outside cmake and/or XCode capabilities, I guess.
> My workaround for that was to write a small utility in Qt to prompt for a 
> password and return it in stdout.  I then set the path of that utility to
the
> SUDO_ASKPASS environment variable so I could set the scripts to run sudo -A
> command instead of sudo command.  This unearthed a second problem.  In my
debug
> build, the script looked in the release directory for LLVMSupport.a and
failed
> as a result of it.
>
> At this point I'm building a release build so I can install the debug
build.
>  If Óscar or somebody more familiar than I at CMake would look into the
issue of
> the release install in the debug build, I'd appreciate it.
I'm not sure what the problem is. Never used XCode nor I have access to
it. What are those scripts? The install scripts generated by CMake for
XCode?

----- Original Message ----
> From: Óscar Fuentes <ofv at wanadoo.es>
> To: Samuel Crow <samuraileumas at yahoo.com>
> Cc: LLVM Developers Mailing List <llvmdev at cs.uiuc.edu>
> Sent: Wed, January 5, 2011 5:00:00 PM
> Subject: Re: Build problems and workarounds with CMake and XCode
> 
> Samuel Crow <samuraileumas at yahoo.com>  writes:
> 
> [snip]
> 
> > I tried making a separate build of LLVM SVN in  XCode using build
files
>created 
>
> > with CMake.  Surprisingly, it  worked better than Eclipse!  The
Build_All
>target 
>
> > completed its  build.  The install target was another story though. 
First of
>
> > all, the commands to install with the terminal command-line needed to 
be
> > prefaced with sudo to work.
> 
> Have you permissions for those  directories?
> 
I'm running in user mode with root equivalence added temporarily to my
account.
 Macs always require you to sudo to access the system directories even when 
you're logged in as an administrator.

It's possible that this may be a CMake bug/oversight.
> >  Secondly, those commands, when executed from  XCode, 
> > have no open console to prompt for a password.
> 
> That lies  outside cmake and/or XCode capabilities, I guess.
> 
It's an Macintosh-ism.  Most files run from icons do not open a text
console.
 My past experience with some Linux GUI toolkits are similar.
> > My workaround for  that was to write a small utility in Qt to prompt
for a
> > password and  return it in stdout.  I then set the path of that
utility to
>the 
>
> >  SUDO_ASKPASS environment variable so I could set the scripts to run
sudo -A
> > command instead of sudo command.  This unearthed a second  problem. 
In my
>debug 
>
> > build, the script looked in the release  directory for LLVMSupport.a
and
>failed 
>
> > as a result of  it.
> >
> > At this point I'm building a release build so I can install  the
debug build.
>
> >  If Óscar or somebody more familiar than I at  CMake would look into
the
>issue of 
>
> > the release install in the debug  build, I'd appreciate it.
> 
> I'm not sure what the problem is. Never used  XCode nor I have access
to
> it. What are those scripts? The install scripts  generated by CMake for
> XCode?
> 
The CMake script generated the XCode project file so I'm assuming it's a
problem
either with CMake or the CMake scripts.  XCode targets are similar to make 
targets except that parallel processing is generally implied without any added 
flags (like make -j).  If this turns out to be a deficiency in CMake itself then
most of this discussion can probably be moved to the CMake mailing list.

My main concern with the CMake scripts is that they required a release-build 
file while making a debug-build install.  This ought not to be.

The rest of my workarounds can be easily fixed by CMake or XCode including a 
graphical password requester for the sudo -A flag to use.  If it's CMake
that
needs it, I can provide source to mine since I used the same GUI toolkit as 
CMake uses.  Really it's just a class wrapper for a ready-made requester
that
comes built in to Qt anyway.

I hope this clears up what I was trying to say,

--Sam